-3498domain: ZAppears in sequencesMcKay-Thompson series of class 6c for Monster.at n=13A007262Triangle read by rows: expansion of Q(y, n), where Q(y,0)=1; Q(y,1)=y; Q(y, n) = -(-2 + 2*(1 - y) - 2*(1 - y)*Q(y, n - 1) + Q(y, n - 2)).at n=57A136202Expansion of Product_{k>=1} (1 - (x*(1 + x))^k).at n=20A309575